//Create a boolean variable to check for a valid IE instance.
var xmlhttp = false;
//Check if we are using IE.
try {
	//If the javascript version is greater than 5.
	xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
	//If not, then use the older active x object.
	try {
	//If we are using IE.
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	} catch (E) {
	//Else we must be using a non-IE browser.
		xmlhttp = false;
	}
}
//If we are using a non-IE browser, create a JavaScript instance of the object.
if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
	xmlhttp = new XMLHttpRequest();
}
//A variable used to distinguish whether to open or close the calendar.
var showCalendar = true;
function showHideCalendar() {
	alert("troioi");
	//The location we are loading the page into.
	var objID = "calendar";
	//Change the current image of the minus or plus.
	if (showCalendar == true){
		//Show the calendar.
		document.getElementById("opencloseimg").src = "images/mins.gif";
		//The page we are loading.
		var serverPage = "calendar.php";
		//Set the open close tracker variable.
		showCalendar = false;
		var obj = document.getElementById(objID);
		xmlhttp.open("GET", serverPage);
		xmlhttp.onreadystatechange = function() {
			if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
				obj.innerHTML = xmlhttp.responseText;
			}
		}
		xmlhttp.send(null);
	} 
	else {
		//Hide the calendar.
		document.getElementById("opencloseimg").src = "images/plus.gif";
		showCalendar = true;
		document.getElementById(objID).innerHTML = "";
	}
}
	